/* Visual studio: purposeful actions, generous diagrams, optional exact inputs. */
.math-lab{position:relative;background:var(--tile);padding:28px;border-radius:24px;border-top:3px solid var(--strong);box-shadow:0 16px 45px #07132608}
.math-lab .workbench-title{margin-bottom:22px;align-items:flex-start}
.math-lab .workbench-title h2{font-size:clamp(1.6rem,3.5vw,2.35rem);line-height:1.1;letter-spacing:-.04em}
.math-lab .lab-subtitle{margin:9px 0 0;font-size:.85rem}
.math-lab .workbench-kicker{font-size:.65rem;letter-spacing:.16em}
.lab-mode-switch{display:inline-flex;padding:4px;background:var(--bg);border:1px solid var(--line);border-radius:12px;gap:4px;margin-bottom:20px;max-width:100%}
.lab-mode-switch button{font:inherit;font-size:.8rem;font-weight:700;border:1px solid transparent;border-radius:9px;padding:10px 18px;min-height:44px;background:transparent;color:var(--ink2)}
.lab-mode-switch button[aria-pressed=true]{background:var(--tile);color:var(--ink);border-color:var(--line);box-shadow:0 2px 5px #00000008}
.math-lab .lab-tabs{gap:6px;padding:0 0 18px}
.math-lab .lab-tabs button{min-height:44px;border-color:transparent;border-radius:7px;background:transparent;color:var(--ink2);padding:8px 12px;font-size:.79rem;box-shadow:none}
.math-lab .lab-tabs button[aria-pressed=true]{color:var(--strong);background:color-mix(in srgb,var(--accent) 16%,var(--tile));border-color:color-mix(in srgb,var(--strong) 30%,var(--line))}
.math-lab .lab-intro{margin:24px 0 20px}.math-lab .lab-intro h3{font-size:1.3rem}.math-lab .lab-intro p{font-size:.86rem}
.math-lab .workbench-layout{grid-template-columns:minmax(0,1.5fr) minmax(285px,1fr);gap:28px;align-items:start}
.math-lab .workbench-controls{padding-top:4px}
.math-lab .workbench-plot{padding:12px;background:var(--bg);border:1px solid var(--line);border-radius:18px}
.math-lab .workbench-svg{border:0;border-radius:8px;background:radial-gradient(ellipse at 50% 40%,color-mix(in srgb,var(--accent) 8%,var(--bg)),var(--bg));touch-action:pan-y}
.math-lab .workbench-svg circle{cursor:default}
.math-lab .lab-plot-tools{padding:0 0 2px 4px;margin:0}.math-lab .lab-plot-tools button{min-width:44px;min-height:44px;background:transparent}
.math-lab .workbench-legend{margin:7px 0 1px;font-size:.7rem}
.lab-eyebrow{font-size:.65rem;text-transform:uppercase;letter-spacing:.1em;color:var(--ink2);font-weight:650}
.lab-equation-touch{display:flex;align-items:flex-start;justify-content:flex-start;gap:3px;margin:16px 0 22px;font-family:Georgia,serif;font-size:clamp(1.15rem,2vw,1.7rem);white-space:nowrap;color:var(--ink)}
.lab-equation-touch>span{padding-top:10px}
.lab-equation-touch button{min-width:44px;min-height:63px;padding:6px 7px 7px;font:inherit;border-radius:8px;border:1px solid var(--line);color:var(--ink);background:var(--tile);cursor:pointer}
.lab-equation-touch button[aria-pressed=true]{background:var(--accent-ink);color:var(--accent);border-color:var(--accent-ink);box-shadow:0 4px 14px #0000000d}
.lab-equation-touch small{display:block;margin-top:6px;font:550 .53rem Archivo,system-ui,sans-serif;letter-spacing:.01em}
.lab-term-explanation{min-height:93px}.lab-term-explanation>b{font-size:.86rem}.math-lab .lab-term-explanation p{font-size:.8rem;margin:7px 0 0;line-height:1.6}
.lab-term-actions,.math-lab .lab-presets{display:flex;flex-wrap:wrap;gap:7px;margin:14px 0 18px}
.lab-term-actions button,.math-lab .lab-presets button{font:650 .77rem Archivo,system-ui,sans-serif;min-height:44px;padding:9px 12px;border:1px solid var(--line);border-radius:9px;background:var(--tile);color:var(--ink)}
.lab-term-actions button[aria-pressed=true]{border-color:var(--strong);color:var(--strong);background:color-mix(in srgb,var(--accent) 12%,var(--tile))}
.math-lab .workbench-equation{font-size:1.35rem;line-height:1.6;margin:0 0 15px;overflow-wrap:anywhere}
.math-lab .lab-select{margin:12px 0 0}.math-lab .lab-select select{min-height:44px;font-size:.83rem}
.math-lab .lab-readout{border:0;border-top:1px solid var(--line);border-radius:0;background:transparent;padding:16px 0 0;margin:20px 0 0;font-size:.87rem;line-height:1.55}
.math-lab .lab-readout span{font-size:.77rem;line-height:1.6;margin-top:8px}
.lab-footer{display:flex;gap:12px;align-items:start;justify-content:space-between;border-top:1px solid var(--line);margin-top:20px;padding-top:12px}
.lab-customize{min-width:0;flex:1}.lab-customize summary{font-size:.75rem;font-weight:650;min-height:44px;display:flex;align-items:center;gap:7px;cursor:pointer;list-style:none}.lab-customize summary:before{content:'+';font-size:1.1rem;color:var(--strong)}.lab-customize[open] summary:before{content:'−'}.lab-customize summary::-webkit-details-marker{display:none}
.lab-exact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding:5px 0 10px}
.math-lab label.lab-exact{margin:0;display:flex;flex-direction:column;gap:6px;font-size:.71rem;line-height:1.4;font-weight:500}
.lab-exact input{width:100%;min-width:0;min-height:44px;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:7px;padding:7px;font:inherit;font-size:.87rem}
.math-lab .workbench-reset,.math-lab .lab-expand{min-height:44px;background:transparent;font-size:.75rem}
.math-lab button:focus-visible,.math-lab summary:focus-visible{outline:3px solid var(--hub-focus);outline-offset:3px}
.lab-announcement{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.lab-dialog .math-lab{padding:30px}.lab-dialog .workbench-title{top:-30px;margin-bottom:18px}
@media(hover:hover){.math-lab .lab-tabs button:hover,.lab-term-actions button:hover,.math-lab .lab-presets button:hover{border-color:var(--strong)}.lab-equation-touch button:hover{box-shadow:0 0 0 2px color-mix(in srgb,var(--strong) 20%,transparent)}}
@media(max-width:920px){.math-lab .workbench-layout{grid-template-columns:minmax(0,1.2fr) minmax(235px,1fr);gap:20px}.lab-equation-touch{font-size:1.15rem;gap:1px}.lab-equation-touch button{padding-inline:5px}.lab-equation-touch small{font-size:.48rem}}
@media(max-width:700px){.math-lab{padding:20px}.math-lab .workbench-layout{grid-template-columns:1fr;gap:22px}.math-lab .workbench-controls{border-top:0;padding-top:0}.lab-equation-touch{font-size:1.7rem;gap:5px;justify-content:center}.lab-equation-touch button{padding-inline:12px}.lab-equation-touch small{font-size:.58rem}.lab-term-explanation{min-height:0}.math-lab .workbench-svg{aspect-ratio:4/3}.lab-dialog .math-lab{padding:20px}.lab-dialog .workbench-title{top:-20px}}
@media(max-width:400px){.math-lab{padding:15px;border-radius:18px}.math-lab .workbench-title{gap:8px}.math-lab .workbench-title h2{font-size:1.5rem}.math-lab .lab-subtitle{font-size:.75rem}.lab-mode-switch{width:100%;display:flex}.lab-mode-switch button{flex:1;font-size:.75rem;padding:8px}.math-lab .lab-tabs button{font-size:.73rem;padding:7px 9px}.lab-equation-touch{font-size:1.4rem;gap:2px}.lab-equation-touch button{padding-inline:8px}.lab-equation-touch small{font-size:.51rem}.lab-exact-grid{grid-template-columns:1fr}}
@media(prefers-reduced-motion:no-preference){.lab-mode-switch button,.lab-equation-touch button,.lab-term-actions button{transition:color 150ms,background-color 150ms,border-color 150ms,box-shadow 150ms}.math-lab .lab-content{animation:studio-enter 180ms ease-out}@keyframes studio-enter{from{opacity:.7;transform:translateY(3px)}to{opacity:1;transform:none}}}
@media print{.math-lab{display:none}}